(57) The present invention relates to an image reading device comprising a light source
(2), a white reference board that is used for shading correction (11), a reading unit
(12) that reads an original while the original moves on an original platen, a detecting
unit (32, 91) that detects whether an original is set on the original platen, an acquiring
unit (92) that causes to move, upon the detecting unit detecting setting of the original
on the original platen, the light source up to a position of the white reference board
and acquires shading correction data by reading the white reference board, a determining
unit (91) that determines, upon receiving an original reading start request, whether
to execute acquisition of the shading correction data again by using the acquiring
unit, before reading a first original, and a shading correcting unit (46) that carries
out, upon the determining unit determining to execute acquisition of the shading correction
data again by using the acquiring unit before reading the first original, the shading
correction by using the acquired shading correction data, and carries out, upon determining
not to execute, the shading correction by using the shading correction data that is
acquired by using the acquiring unit at the time of detecting setting of the original.
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